单项选择题

A．On the highest branches of trees.
B．Inside tree trunks.
C．On the ground.
D．In cold places.
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ceremony
单项选择题
A．Interview some high school students.B．Finish their chemistry experiment.C．Write their lab reports.D．Find our professor Smith’s schedule.
A．Interview some high school students.
B．Finish their chemistry experiment.
C．Write their lab reports.
D．Find our professor Smith’s schedule.
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